114 lines
4.2 KiB
PHP
114 lines
4.2 KiB
PHP
<?php
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// This file is part of GNU social - https://www.gnu.org/software/social
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//
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// GNU social is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// GNU social is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with GNU social. If not, see <http://www.gnu.org/licenses/>.
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/**
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* ActivityPub implementation for GNU social
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*
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* @package GNUsocial
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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* @copyright 2018-2019 Free Software Foundation, Inc http://www.fsf.org
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* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
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* @link http://www.gnu.org/software/social/
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*/
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defined('GNUSOCIAL') || die();
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/**
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* ActivityPub error representation
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*
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* @category Plugin
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* @package GNUsocial
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
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*/
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class Activitypub_create
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{
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/**
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* Generates an ActivityPub representation of a Create
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*
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* @param string $actor
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* @param array $object
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* @param bool $directMessage whether it is a private Create activity or not
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* @return array pretty array to be used in a response
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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*/
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public static function create_to_array(string $actor, array $object, bool $directMessage = false): array
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{
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$res = [
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'@context' => 'https://www.w3.org/ns/activitystreams',
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'id' => $object['id'] . '#create',
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'type' => 'Create',
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'directMessage' => $directMessage,
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'to' => $object['to'],
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'cc' => $object['cc'],
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'actor' => $actor,
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'object' => $object
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];
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return $res;
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}
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/**
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* Verifies if a given object is acceptable for a Create Activity.
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*
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* @param array $object
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* @return bool True if acceptable, false if valid but unsupported
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* @throws Exception if invalid
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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*/
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public static function validate_object($object): bool
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{
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if (!is_array($object)) {
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common_debug('ActivityPub Create Validator: Rejected because of invalid Object format.');
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throw new Exception('Invalid Object Format for Create Activity.');
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}
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if (!isset($object['type'])) {
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common_debug('ActivityPub Create Validator: Rejected because of Type.');
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throw new Exception('Object type was not specified for Create Activity.');
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}
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if (isset($object['directMessage']) && !is_bool($object['directMessage'])) {
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common_debug('ActivityPub Create Validator: Rejected because Object directMessage is invalid.');
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throw new Exception('Invalid Object directMessage.');
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}
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switch ($object['type']) {
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case 'Note':
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// Validate data
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return Activitypub_notice::validate_note($object);
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break;
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default:
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throw new Exception('This is not a supported Object Type for Create Activity.');
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}
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return true;
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}
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/**
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* Verify if received note is private (direct).
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* Note that we're conformant with the (yet) non-standard directMessage attribute:
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* https://github.com/w3c/activitypub/issues/196#issuecomment-304958984
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*
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* @param array $activity received Create-Note activity
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* @return bool true if note is private, false otherwise
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* @author Bruno casteleiro <brunoccast@fc.up.pt>
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*/
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public static function isPrivateNote(array $activity): bool
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{
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if (isset($activity['directMessage'])) {
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return $activity['directMessage'];
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}
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return empty($activity['cc']) && !in_array('https://www.w3.org/ns/activitystreams#Public', $activity['to']);
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}
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}
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